When someone adopts a popular point of view for the primary purpose of recognition and/or acceptance by others.

Man, Nanlawon has been posting on our forums forever and everyone hates him. Then this new chick, Toolesbabe, joins the forum and just hops on the bandwagon ripping on him, even though she'd never even read a single post by him. WTF?!

What people will "ride" or get on when they want to be accepted, espescially in the NFL. People will get on the (Colts) bandwagon and suddenly become their fans because they are doing really good or because they have a large number of fans so they can be accepted.

People will ride a bandwagon even if they dont give a shit about football or whatever the bandwagon is.

This kid at my school wears a Cincinnati Bengals shirt to school when he is a Denver fan.
Me yells:BANDWAGON!

Girls who don't care about football chant: who dey! who dey! who dey! who dey!